art deco radiator caps as art, in a museum exhibit in France "The International Exhibition of Modern Decorative and Industrial Arts, Paris 1925"

http://lesdiagonalesdutemps.over-blog.com/article-1925-quand-l-art-deco-seduit-le-monde-a-la-cite-de-l-architecture-et-du-patrimoine-121925157.html

 http://paris-pepites.fr/WordPress3/quand-lart-deco-seduit-le-monde/

Or you can buy the book

https://www.amazon.com/1925-Quand-s%C3%A9duit-monde-French/dp/2915542554